Mazuki, Norlailatullaili (2012) Effect Of Aluminium (Al) And Nickel (Ni) Addition On Formation Of Titanium Silicon Carbide (Ti3sic2) Via Arc Melting. Masters thesis, Universiti Sains Malaysia.
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Abstract
Ti3SiC2 mempunyai gabungan luar biasa kedua-dua sifat seramik dan logam seperti ketumpatan yang rendah, kekuatan dan modulus yang tinggi, kebolehmesinan yang baik, dan ketahanan terhadap kejutan haba. Malangnya, fasa tunggal Ti3SiC2 sukar untuk disintesis kerana wujudnya fasa titanium karbida (TiC) dan titanium silisida (TixSiy). Serbuk titanium, silikon, grafit, aluminium, dan nikel disediakan mengikut nisbah stoikiometri iaitu Ti:Si:C:Al:Ni = 3:1:2:x:y. Serbuk-serbuk berkenaan dicampur dan dikisar dengan menggunakan mesin pengisar bola selama 24 jam sebelum dipadatkan. Campuran serbuk yang telah dipadatkan telah diarka menggunakan mesin peleburan arka selama 5 saat. Kesan penambahan aluminium yang berbeza dikaji untuk memerhatikan ketulenan Ti3SiC2. Selain itu, kesan penambahan nikel yang berbeza dikaji untuk menghasilkan Ti3SiC2 dengan ketumpatan tinggi. Kekerasan setiap sampel telah diperolehi daripada ujian kekerasan Vickers. Berdasarkan keputusan yang diperolehi, sampel yang mempunyai Ti3SiC2 dengan ketulenan dan ketumpatan tinggi adalah TSC 0.2Al/0.2Ni. Peratusan Ti3SiC2 dalam produk akhir adalah 90 % berat dan ketumpatan relatif adalah 89.61 %. Walau bagaimanapun, kekerasan TSC 0.2Al/0.2Ni adalah yang paling rendah (3.7 GPa) berbanding dengan yang lain. Di samping itu, produk Ti3SiC2 juga dikaji melalui pemerhatian SEM. TiC danTi5Si3 muncul sebagai fasa kedua dalam semua produk. _____________________________________________________________________________________________________________ Ti3SiC2 is a layered ternary carbide that possesses unique properties that combining excellent characteristics of metals and ceramics such as low density, high strength and modulus, good machinability, and good resistance to thermal shock. Unfortunately, it is difficult to synthesize single phase Ti3SiC2 material, being often accompanied by unacceptably large amounts of TiC and titanium silicides (TixSiy). Elemental powders of titanium, silicon, graphite, aluminium, and nickel were prepared according to stoichiometric ratio of Ti:Si:C:Al:Ni = 3:1:2:x:y. These powders were mixed and milled using ball milling machine for 24 hours before being compacted. The compacted powder were arced by using arc melting machine for 5 seconds. The effect of different aluminium addition was studied to observe the purity of Ti3SiC2. Besides, the effect of different nickel addition was studied to produce Ti3SiC2 with high density. The hardness of each sample was obtained from Vickers hardness test. From the result obtained, the sample that has high purity and density of Ti3SiC2 was TSC 0.2Al/0.2Ni. The percentage of Ti3SiC2 in the final product was 90 wt. % and the relative density was 89.61 %. However, the hardness of TSC 0.2Al/0.2Ni was the lowest (3.7 GPa) compared to others. Besides, Ti3SiC2 were characterized by Scanning Electron Spectroscopy. TiC and Ti5Si3 appeared to be the common and dominant second phases in all products.
| Item Type: | Thesis (Masters) |
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| Additional Information: | full text available at http://irplus.eng.usm.my:8080/ir_plus/institutionalPublicationPublicView.action?institutionalItemId=1917 |
| Subjects: | T Technology T Technology > TP Chemical Technology > TP200-248 Chemicals: Manufacture, use, etc. |
| Divisions: | Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Bahan & Sumber Mineral (School of Material & Mineral Resource Engineering) > Thesis |
| Depositing User: | Mr Mohd Jasnizam Mohd Salleh |
| Date Deposited: | 05 Jun 2018 03:19 |
| Last Modified: | 05 Jun 2018 03:19 |
| URI: | http://eprints.usm.my/id/eprint/40690 |
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